| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive jack for mounting capable of being easily mounted on a working platform, a carrier and the like, and being easily demounted. SOLUTION: A lower frame having left and right symmetric approximately-rectangular bent parts with slots, and an upper frame having the shape same as the lower frame are vertically symmetrically mounted in a state that the bent parts are opposite to each other, and two crossing lift arms comprising means bending and stretching in parallel with each other, are mounted between the upper and lower frames in a state of being symmetric left and right and close to the bent parts. An end part of one arm of the crossing lift arms is journaled to a moving shaft fitted in the slot of the bent part of the lower frame, the other end part of the same is journaled to a fixed shaft locked in the bent part of the upper frame, further an end part of the other arm of the crossing lift arms is journaled to a moving shaft fitted in the slot of the bent part of the upper frame, and the other end part of the arm is journaled to a fixed shaft locked in the bent part of the lower frame. COPYRIGHT: (C)2005,JPO&NCIPI
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